Tending self in bed causes an incorrect report string

[aph3rson]

When a pawn tends themselves in bed, the report string incorrectly states that they're tending to the bed (not the colonist in the bed).

This appears to be because the same JobDriver is used for both self-tend and self-tend-in-bed, and the bed is kept as targetA.

A report string like tending to $colonist in $bed with kit. might be better. A new JobDef might be needed to support that, though.